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 <b>代码如注释 : flag在Y29uZmln.php中，请使用本地文件包含方式获得flag</b>
    <b>
    <pre>
        <?php
        header("Content-Type: text/html;charset=utf-8"); 
        $page=$_GET['page'];
        if (isset($_GET['page'])){
            include("$page");
        } 
        else{
      echo 'page!!!!'; 
        } 
        ?>
    </pre>
    </b>
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